Error("data did not match any variant of untagged enum LambdaRequest")

[johhnsmmith198]

Hi Nicolas,
Excellent work thank you so much!

I was trying to run it locally, everything seemed fine but I cannot interact with local sam.

here are the steps that I ran:

• updated some dependencies from 0.0.24-alpha to 0.0.25-alpha because it seems 0.0.24-alpha are not available anymore
• build and deploy the first time to create was resources

docker run --rm --privileged multiarch/qemu-user-static --reset -p yes

make build 
sam deploy --stack-name serverless-rust-demo --resolve-s3 --capabilities CAPABILITY_IAM

• run the local API

sam local start-api --debug --profile default

-try to insert an item

curl -X PUT -H "Content-Type: application/json" -d '{"id"": "i1", "name": "name1", "price": "1"}' http://localhost:3000/i1

some resulting logs

2021-11-17 06:59:10,537 | Mounting PutProductFunction at http://127.0.0.1:3000/{id} [PUT]
2021-11-17 06:59:10,537 | Mounting DeleteProductFunction at http://127.0.0.1:3000/{id} [DELETE]
2021-11-17 06:59:10,537 | Mounting GetProductFunction at http://127.0.0.1:3000/{id} [GET]
2021-11-17 06:59:10,537 | Mounting GetProductsFunction at http://127.0.0.1:3000/ [GET]
2021-11-17 06:59:10,537 | You can now browse to the above endpoints to invoke your functions. You do not need to restart/reload SAM CLI while working on your functions, changes will be reflected instantly/automatically. You only need to restart SAM CLI if you update your AWS SAM template
2021-11-17 06:59:10,537 | Localhost server is starting up. Multi-threading = True
2021-11-17 06:59:10  * Running on http://127.0.0.1:3000/ (Press CTRL+C to quit)
2021-11-17 06:59:19,628 | Constructed String representation of Event Version 2.0 to invoke Lambda. Event: {"version": "2.0", "routeKey": "PUT /<id>", "rawPath": "/i1", "rawQueryString": "", "cookies": [], "headers": {"Host": "127.0.0.1:3000", "User-Agent": "curl/7.68.0", "Accept": "*/*", "Content-Type": "application/json", "Content-Length": "44", "X-Forwarded-Proto": "http", "X-Forwarded-Port": "3000"}, "queryStringParameters": {}, "requestContext": {"accountId": "123456789012", "apiId": "1234567890", "http": {"method": "PUT", "path": "/i1", "protocol": "HTTP/1.1", "sourceIp": "127.0.0.1", "userAgent": "Custom User Agent String"}, "requestId": "d448b162-7c1c-4bad-bba2-0f10bf9257f4", "routeKey": "PUT /<id>", "stage": "$default", "time": "16/Nov/2021:19:59:10 +0000", "timeEpoch": 1637092750, "domainName": "localhost", "domainPrefix": "localhost"}, "body": "{\"id\"\": \"i1\", \"name\": \"name1\", \"price\": \"1\"}", "pathParameters": {"id": "i1"}, "stageVariables": null, "isBase64Encoded": false}
2021-11-17 06:59:19,629 | Found one Lambda function with name 'PutProductFunction'
2021-11-17 06:59:19,629 | Invoking bootstrap (provided.al2)
2021-11-17 06:59:19,629 | Environment variables overrides data is standard format
2021-11-17 06:59:19,629 | Loading AWS credentials from session with profile 'default'
2021-11-17 06:59:19,639 | Resolving code path. Cwd=/home/pc/Documents/funspace/serverless-rust-demo-main, CodeUri=/home/pc/Documents/funspace/serverless-rust-demo-main/build/put-product
2021-11-17 06:59:19,639 | Resolved absolute path to code is /home/pc/Documents/funspace/serverless-rust-demo-main/build/put-product
2021-11-17 06:59:19,639 | Code /home/pc/Documents/funspace/serverless-rust-demo-main/build/put-product is not a zip/jar file
2021-11-17 06:59:19,651 | Skip pulling image and use local one: public.ecr.aws/sam/emulation-provided.al2:rapid-1.35.0-arm64.

2021-11-17 06:59:19,651 | Mounting /home/pc/Documents/funspace/serverless-rust-demo-main/build/put-product as /var/task:ro,delegated inside runtime container
2021-11-17 06:59:20,136 | Starting a timer for 5 seconds for function 'PutProductFunction'
START RequestId: ba4e9de5-a60f-499a-9912-74010803ddee Version: $LATEST
{"timestamp":"Nov 16 19:59:20.255","level":"INFO","fields":{"message":"config file not found","path":"~/.aws/config"},"target":"aws_config::profile::parser::source","span":{"name":"load_config_file"},"spans":[{"name":"get_store"},{"name":"load_config_file"}]}
{"timestamp":"Nov 16 19:59:20.270","level":"INFO","fields":{"message":"config file loaded","path":"~/.aws/config","size":"0"},"target":"aws_config::profile::parser::source","span":{"name":"load_config_file"},"spans":[{"name":"get_store"},{"name":"load_config_file"}]}
{"timestamp":"Nov 16 19:59:20.271","level":"INFO","fields":{"message":"config file not found","path":"~/.aws/credentials"},"target":"aws_config::profile::parser::source","span":{"name":"load_credentials_file"},"spans":[{"name":"get_store"},{"name":"load_credentials_file"}]}
{"timestamp":"Nov 16 19:59:20.271","level":"INFO","fields":{"message":"config file loaded","path":"~/.aws/credentials","size":"0"},"target":"aws_config::profile::parser::source","span":{"name":"load_credentials_file"},"spans":[{"name":"get_store"},{"name":"load_credentials_file"}]}
{"timestamp":"Nov 16 19:59:20.273","level":"WARN","fields":{"message":"failed to get selected 'default' profile"},"target":"aws_config::profile::retry_config","span":{"name":"get_store"},"spans":[{"name":"get_store"}]}
{"timestamp":"Nov 16 19:59:20.301","level":"INFO","fields":{"message":"Initializing DynamoDB store with table name: Table"},"target":"products::utils","span":{"name":"get_store"},"spans":[{"name":"get_store"}]}
Error: Error("data did not match any variant of untagged enum LambdaRequest", line: 0, column: 0)
END RequestId: ba4e9de5-a60f-499a-9912-74010803ddee
REPORT RequestId: ba4e9de5-a60f-499a-9912-74010803ddee  Init Duration: 0.16 ms  Duration: 310.09 msBilled Duration: 400 ms  Memory Size: 128 MB     Max Memory Used: 128 MB
2021-11-17 06:59:20,734 | Cleaning all decompressed code dirs
2021-11-17 06:59:20,735 | Unable to find Click Context for getting session_id.
2021-11-17 06:59:20,735 | Invalid lambda response received: Lambda response must be valid json
2021-11-17 06:59:20 127.0.0.1 - - [17/Nov/2021 06:59:20] "PUT /i1 HTTP/1.1" 502 -

What am I doing wrong, please?
Thanks

[nmoutschen]

Hey @johhnsmmith198 !

Thanks a lot for creating this issue. You're not doing anything wrong. This is an issue between the event that SAM local sends, and the LambdaRequest representation.

You can find the related issues here:

• For the Lambda Rust runtime: Data did not match any variant of untagged enum LambdaRequest with SAM local awslabs/aws-lambda-rust-runtime#365
• For the SAM CLI: stageVariables with value null for sam local start-api aws/aws-sam-cli#3468

And here's the PR to make the Rust runtime more permissive: awslabs/aws-lambda-rust-runtime#366

[johhnsmmith198]

Hey @nmoutschen thanks for the explanation.
If not with SAM, Can I ask how have you been running your code locally, please?

[nmoutschen]

The PR with the fix for this is merged into the main branch for the lambda_http crate, but not yet deployed. You can use the version from git by changing the dependency in your Cargo.toml file like this:

lambda_http = { git = "https://github.com/awslabs/aws-lambda-rust-runtime/lambda-http" }

[johhnsmmith198]

Hey @nmoutschen
I had to make it looks like this in Cargo.toml

lambda_http = { git = "https://github.com/awslabs/aws-lambda-rust-runtime", package="lambda_http", optional = true }

I see the log durring build

...
 Compiling lambda_runtime v0.4.1 (https://github.com/awslabs/aws-lambda-rust-runtime#576f6013)
   Compiling lambda_runtime v0.4.1
   Compiling aws-smithy-http-tower v0.28.0-alpha
   Compiling aws-endpoint v0.0.25-alpha
   Compiling aws-http v0.0.25-alpha
   Compiling aws-sig-auth v0.0.25-alpha
   Compiling lambda_http v0.4.1 (https://github.com/awslabs/aws-lambda-rust-runtime#576f6013)
...

Still I run sam

 sam local start-api --debug --profile default

and query it simply with

curl -X PUT -H "Content-Type: application/json" -d '{"id"": "i1", "name": "name1", "price": "1"}' http://127.0.0.1:3000/i1

I get the exact same error:

{"timestamp":"Nov 19 11:17:05.261","level":"INFO","fields":{"message":"Initializing DynamoDB store with table name: Table"},"target":"products::utils","span":{"name":"get_store"},"spans":[{"name":"get_store"}]}
Error: Error("data did not match any variant of untagged enum LambdaRequest", line: 0, column: 0)
END RequestId: b2b67611-774c-4483-85b5-f563bce0a4ac
REPORT RequestId: b2b67611-774c-4483-85b5-f563bce0a4ac  Init Duration: 0.07 ms  Duration: 309.97 msBilled Duration: 400 ms Memory Size: 128 MB     Max Memory Used: 128 MB
2021-11-19 22:17:05,724 | Cleaning all decompressed code dirs
2021-11-19 22:17:05,724 | Unable to find Click Context for getting session_id.
2021-11-19 22:17:05,725 | Invalid lambda response received: Lambda response must be valid json
2021-11-19 22:17:05 127.0.0.1 - - [19/Nov/2021 22:17:05] "PUT /i1 HTTP/1.1" 502 -

[nmoutschen]

Hey @johhnsmmith198 !

I just noticed one issue with your JSON payload: you have two quotes after the id tag:

{"id"": "i1", "name": "name1", "price": "1"}

It should be:

{"id": "i1", "name": "name1", "price": "1"}

I just tried on my end and it works for me with the Cargo.toml change.

[johhnsmmith198]

Thank you very much. What a silly mistake this one.
Thank you for putting this demo on and improving important library like lambda_http in the process.
Cheers